Adds OCaml libraries: uucd, uunf, uutf and xmlm

Four OCaml libraries contributed by Daniel Bünzli for unicode and xml
processing.

 -  xmlm: Streaming XML codec for OCaml
 -  uutf: Non-blocking streaming Unicode codec for OCaml
 -  uunf: Unicode text normalization for OCaml
 -  uucd: Unicode character database decoder for Ocaml

Homepage: http://erratique.ch/software

pkgs/development/ocaml-modules/uutf/default.nix

@@ -0,0 +1,37 @@
+{stdenv, fetchurl, ocaml, findlib, opam}:
+let
+  pname = "uutf";
+  version = "0.9.3";
+  webpage = "http://erratique.ch/software/${pname}";
+  ocaml_version = (builtins.parseDrvName ocaml.name).version;
+in
+stdenv.mkDerivation rec {
+
+  name = "ocaml-${pname}-${version}";
+
+  src = fetchurl {
+    url = "${webpage}/releases/${pname}-${version}.tbz";
+    sha256 = "0xvq20knmq25902ijpbk91ax92bkymsqkbfklj1537hpn64lydhz";
+  };
+
+  buildInputs = [ ocaml findlib opam ];
+
+  createFindlibDestdir = true;
+
+  unpackCmd = "tar xjf $src";
+
+  buildPhase = "./pkg/build true";
+
+  installPhase = ''
+    opam-installer --script --prefix=$out ${pname}.install > install.sh
+    sh install.sh
+    ln -s $out/lib/${pname} $out/lib/ocaml/${ocaml_version}/site-lib/
+  '';
+
+  meta = {
+    description = "Non-blocking streaming Unicode codec for OCaml";
+    homepage = "${webpage}";
+    platforms = ocaml.meta.platforms;
+    license = stdenv.lib.licenses.bsd3;
+  };
+}